Speaking at a rally in Ohio, Trump began needling Clinton
over her "stamina," an issue he has raised for months.

"You think Hillary would be able to stand up here for an hour and
do this?" he rhetorically asked the crowd, noting how
hot it was in the venue. "I don’t know. I don’t think so."

Clinton was seen on video struggling to stand and
walk after her campaign said she “overheated” at a
Sunday memorial event marking the 15th anniversary of the
September 11, 2001, terror attacks. Her doctor
later released a statement saying the
Democratic presidential candidate's fatigue was related to a
previously undisclosed pneumonia diagnosis.

In a Thursday morning interview with New York radio host Fred
Dicker, Trump continued to press the issue, again
making note of Clinton's "stamina."

"Well, I just don't know," he said when asked if she had the
stamina to campaign through election day in November. "But for
this, you need tremendous stamina."

Trump's campaign, which has avoided the topic as well, also
appeared to take a swipe at Clinton when releasing a summary
of Trump's physical from his doctor Harold Bornstein.

"We are pleased to disclose all of the test results, which
show that Mr. Trump is in excellent health and has the stamina to
endure — uninterrupted — the rigors of a punishing and
unprecedented presidential campaign and, more importantly, the
singularly demanding job of president of the United States," the
Trump campaign said in a news release.

Trump's mid-week behavior appeared to represent a shift
from when he refused to talk about the topic. For instance,
during an interview with Fox News host Sean Hannity, Trump
repeatedly dodged questions on the subject.

The health of both candidates has taken center stage after
Clinton's Sunday episode. Both candidates have released letters
from their doctors describing their fitness for office, as both
Clinton, who is 68 years old, and Trump, who is 70, are among the
oldest nominees to seek the presidency.